Figure 5

(a) Energy level diagram of blue TADF-OLED structure using DBFPO or DPEPO as a host and molecular structure of DBFPO and DPEPO, (b) current density versus voltage versus luminance curves, (c) EQE versus luminance curves, and (d) CIE color coordinates of DPEPO and DBFPO blue device, (e) Normalized PL spectra of DPEPO:DMAC-DMT(40%) and DBFPO:DMAC-DMT(40%) films and normalized EL spectra of DPEPO and DBFPO blue devices.